欢迎访问ic37.com |
会员登录 免费注册
发布采购

AFE1124E 参数 Datasheet PDF下载

AFE1124E图片预览
型号: AFE1124E
PDF下载: 下载PDF文件 查看货源
内容描述: HDSL / MDSL模拟前端 [HDSL/MDSL ANALOG FRONT END]
分类和应用:
文件页数/大小: 11 页 / 162 K
品牌: BB [ BURR-BROWN CORPORATION ]
 浏览型号AFE1124E的Datasheet PDF文件第3页浏览型号AFE1124E的Datasheet PDF文件第4页浏览型号AFE1124E的Datasheet PDF文件第5页浏览型号AFE1124E的Datasheet PDF文件第6页浏览型号AFE1124E的Datasheet PDF文件第7页浏览型号AFE1124E的Datasheet PDF文件第8页浏览型号AFE1124E的Datasheet PDF文件第10页浏览型号AFE1124E的Datasheet PDF文件第11页  
0.1µF  
0.1µF  
0.1µF  
REFP  
VCM  
REFN  
1:2 Transformer  
Tip  
13  
13Ω  
txLINE+  
txLINE–  
0.01µF  
Ring  
+
+
0.01µF  
Input Antialias Filter  
fc 2 x Symbol Rate  
Compromise  
Hybrid  
750Ω  
rxbaudCLK  
rx48xCLK  
Data Out  
txbaudCLK  
tx48xCLK  
Data In  
rxHYB+  
AFE1124  
100pF  
HDSL DSP  
750Ω  
rxHYB–  
rxLINE–  
750Ω  
100pF  
GNDA  
GNDA  
GNDA  
750Ω  
rxLINE+  
DVDD DVDD  
AVDD AVDD AVDD  
5V to 3.3V Digital  
0.1µF  
5V Analog  
1 - 10µF  
0.1µF 0.1µF 0.1µF  
0.1µF  
FIGURE 6. Basic Connection Diagram.  
for the rxLINE and rxHYB differential inputs should be  
approximately 1MHz for T1 and E1 symbol rates. Suggested  
values for the filter are 750for each of the two input  
resistors and 100pF for the capacitor. Together the two  
750resistors and the 100pF capacitor result in a 3dB  
frequency of just over 1MHz. The 750input resistors will  
result in minimal voltage divider loss with the input imped-  
ance of the AFE1124.  
For the transmit channel, the pulse shape and the power  
spectral density scale directly with the clock rate. The power  
spectral density shown in Curve 1 and the pulse template  
shown in Curve 2 are measured at the output of the trans-  
former. The transformer and the RC circuit on the output  
provide some smoothing for the output transmission. At  
lower bit rates, the amount of smoothing will be less.  
The antialiasing filters will give best performance with 3dB  
frequency approximately equal to the bit rate. For instance,  
a 3dB frequency of 320kHz may be used for a single line bit  
rate of 320k bits per second.  
RXHYB AND RXLINE INPUT  
ANTI-ALIASING FILTERS  
An external input antialiasing filter is needed on the hybrid  
and line inputs as shown in the Basic Connection Diagram  
above. The –3dB frequency of the input anti-aliasing filter  
®
9
AFE1124